SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3dc6d6962a14a629487476265d405a3638a4f817b5d825b7a904fa5039553525' 
  AND token = 'zpQxrnoraFW4+xLKuTX1O59Tj2Y+kp2gJuh5kyVCV3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}